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Learn how to solve the `Failed to convert value of type 'java.lang.String' to required type 'java.sql.Date'` error in your Spring Boot REST API and correctly handle date parameters with JPA.
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Resolving java.sql.Date Conversion Issues in Spring Boot REST API

When building RESTful APIs using Spring Boot and JPA, developers often run into issues handling date parameters. An example of this challenge is converting URL path variables into a specific date type that your application can process efficiently.

In this guide, we'll take a closer look at a common error that many developers face, particularly when attempting to pass date parameters through a REST API. We'll explore how to resolve a conversion error related to java.sql.Date in your Spring Boot application.

The Problem: java.sql.Date Conversion Error

Imagine you have a DB2 table containing a TIMESTAMP field named SOLD_DATE, and you want to retrieve data based on a specific date range by passing start and end dates as URL parameters.

Here's an example of what the URL might look like:

[[See Video to Reveal this Text or Code Snippet]]

However, upon executing your API endpoint, you encounter the following error:

[[See Video to Reveal this Text or Code Snippet]]

This error arises because of the discrepancy between the expected and actual types in the controller's date parameter.

The Solution: Correcting the Date Type

The key to resolving this issue lies in the compatibility of the date types being used in your application. Here’s how to fix the conversion issue step by step:

Step 1: Update Your Controller

In your controller, you have defined the following method:

[[See Video to Reveal this Text or Code Snippet]]

The current issue stems from the Date parameter type. Instead of using java.sql.Date, switch to java.util.Date to allow Spring to apply the necessary format conversion correctly.

Step 2: Modify the Repository Query

Your repository method already looks correct:

[[See Video to Reveal this Text or Code Snippet]]

This will work as expected once you've changed the date parameter types in the controller.

Step 3: Test Your API

After making the changes, test the API again with the same URL. You should no longer encounter the conversion error, and the API should successfully return the list of cars sold between the specified dates.

Summary

Handling date parameters in Spring Boot can lead to unexpected issues, particularly when there is a type mismatch. In this post, we addressed how to resolve the Failed to convert value of type 'java.lang.String' to required type 'java.sql.Date' error by ensuring that you use java.util.Date instead of java.sql.Date when using the -DateTimeFormat annotation for path variables.

By implementing these changes, you can streamline your date handling and enhance the functionality of your Spring Boot REST API. If you have any questions or run into issues, don’t hesitate to reach out or leave a comment below!